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From "Karthik Ranganathan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4463) Run more aggressive compactions during off peak hours
Date Thu, 22 Sep 2011 23:25:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113017#comment-13113017
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Karthik Ranganathan commented on HBASE-4463:
--------------------------------------------

Initially we are going to specify a start and stop for off peak hours... a more automatic
detection based on response latencies and data read/transferred could be done, but is much
harder to get right.

> Run more aggressive compactions during off peak hours
> -----------------------------------------------------
>
>                 Key: HBASE-4463
>                 URL: https://issues.apache.org/jira/browse/HBASE-4463
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Karthik Ranganathan
>            Assignee: Karthik Ranganathan
>
> The number of iops on the disk and the top of the rack bandwidth utilization at off peak
hours is much lower than at peak hours depending on the application usage pattern. We can
utilize this knowledge to improve the performance of the HBase cluster by increasing the compact
selection ratio to a much larger value during off-peak hours than otherwise - increasing hbase.hstore.compaction.ratio
(1.3 default) to hbase.hstore.compaction.ratio.offpeak (5 default). This will help reduce
the average number of files per store.

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